Manganese sulfide (MnS) thin films are deposited by successive ionic layer adsorption and reaction method on stainless steel substrate. Manganese acetate and sodium sulfide are used as the source materials for the preparation of thin films. These films are characterized by X‐ray diffraction (XRD) which shows that the prepared MnS films are polycrystalline in nature, having a crystallite size of 0.2647 nm. It is determined from the broadenings of corresponding XRD peaks by using Debye–Scherrer's formula. The wettability study of deposited MnS thin film is hydrophilic in nature. Fourier‐transform infrared spectroscopy technique is used to determine the functional groups present in MnS material and its chemical composition. Bandgap of MnS thin films is measured using ultraviolet‐visible spectroscopy which shows a gap of 2.6 eV. The present work focuses on studying the supercapacitive properties of MnS material which is used as electrode material for supercapacitor. The highest specific capacitance (Cs) of MnS 632.91 Fg−1 is obtained for 100 mV S−1 scan rate by using galvanostatic charge discharge technique.

Metal oxide based supercapacitors have emerged as one of the most elegant storage systems with exclusive characteristics with high power density and long‐term cycling stability. Cobalt oxide (Co3O4) has particularly obtained rising interest due to their natural abundance, environment friendly, low cost, and high specific capacitance. Co3O4 thin film electrodes were successfully deposited via a simple and easy galvanostatic electrodeposition technique on to cheap stainless steel substrate. As‐deposited thin films were heated at 500 °C for its conversion to Co3O4. These films were characterized for XRD, SEM, and CA to understand the structural, morphological and wettability properties of Co3O4 electrode. By using cyclic voltammetry, charge‐discharge study and supercapacitive behavior of Co3O4 electrode were examined. The Co3O4 electrode showed maximum specific capacitance of 554 F g–1 at 5 mV s–1 in 1 m NaOH electrolyte. The specific energy, specific power, and coulombic efficiency showed 16.32 Wh kg–1, 11.72 kW kg–1, and 94.2%, respectively. The results clearly evidenced that those devices based on Co3O4 electrodes are promising energy storage devices for microelectronic applications as well as high energy supercapacitors.

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Copper oxide (CuO) thin films have been deposited on glass and steel substrates but here work is done on steel substrate by novel aqueous based Reflux method whereas deposition of CuO thin film uses copper sulfate as copper ion source from an aqueous alkaline medium. The effects of copper ion concentration, temperature, and deposition time are studied for deposition of thin films. The CuO thin films are characterized by XRD, UV, SEM, and contact angle. The X‐Ray diffraction results reveal that CuO is monoclinic in nature. Optical band gap is observed from UV–visible spectrophotometer which is 1.9 eV. The surface morphological studies obtained from SEM micrograph show rice shape of exterior. While wettability test shows hydrophobic nature of CuO. This material characterization of CuO thin film clearly indicates that these films can be widely used in various applications such as gas sensor, transducers such as thermocouple to measure thermo e.m.f, solar cells, and super capacitor.